Rion DA-21, Инструкция по эксплуатации

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65
Preparations
Input settings
The four signal input connectors (BNC connectors) can not only accept a
signal, they also allow output of a constant current to a CCLD (Constant Cur-
rent Line Drive) type sensor. Some CCLD sensors use a basic preamplifi er +
accelerometer or microphone confi guration. The DA-21 can record up to four
input signals. The input connectors 1 to 4 are assigned to channels 1 to 4.
Input setting (<Input> menu: Inp)
The setting is made for each channel separately, with the “Inp” item on
<Input> menu.
AC For sensors that output an electrical signal without DC com-
ponents
DC components and components 0.3 Hz or below are blocked.
Example: AC output of sound level meter or vibration
meter
DC For sensors that output an electrical signal including DC
Example: Temperature meter or tachometer output, DC
output of sound level meter
CCLD For sensors requiring a constant current source
For such sensors, a constant current is supplied via the input
connectors of the DA-21.
Example 1: Combination of microphone UC-52 or UC-59
or similar with preamplifi er NH-22 (CCLD: 2
mA) or similar
Example 2: Piezoelectric accelerometer with built-in pre-
amplifi er PV-41, PV-91C, PV-97I (3-axis) or
similar
VP4x Sensor connected via the charge converter VP-40
Example: Accelerometer PV-85 or PV-90B etc. connected
via the charge converter VP-40